Congestion control and priority handling in device-to-device (D2D) communications

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may iterate a value of a channel access counter (CAC) to a trigger value based at least in part on configuring the value of the CAC. In some aspects, the first wireless communication device may utilize a channel access mechanism to select a set of time-frequency resources for a transmission of a packet based at least in part on iterating the value of the CAC to the trigger value. In some aspects, the first wireless communication device may transmit the packet to a second wireless communication device via the set of time-frequency resources based at least in part on utilizing the channel access mechanism to select the set of time-frequency resources for the transmission. Numerous other aspects are provided.

What is claimed is: 
     
       1. A wireless communication device for wireless communication, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to:
 iterate a value of a channel access counter (CAC) based at least in part on a transmission window, wherein a size of the transmission window is based at least in part on at least one of:
 a quantity of candidate resources that is available in a slot, 
 a quantity of slots associated with a transmission of a packet, or 
 a combination of the quantity of candidate resources that is available in the slot and the quantity of slots associated with the transmission; and 
 
 utilize a channel access mechanism based at least in part on that the value of the CAC satisfies a trigger value. 
 
 
     
     
       2. The wireless communication device of  claim 1 , wherein, to utilize the channel access mechanism, the one or more processors are configured to:
 utilize, based at least in part on the value of the CAC satisfying the trigger value, the channel access mechanism to select a set of time-frequency resources for the transmission. 
 
     
     
       3. The wireless communication device of  claim 1 , wherein the size of the transmission window is further based at least in part on at least one of:
 a priority associated with the packet, 
 a quality of service (QoS) value associated with the packet, or 
 a combination of the priority and the QoS value. 
 
     
     
       4. The wireless communication device of  claim 1 , wherein the value of the CAC has a starting value that is based at least in part on the size of the transmission window. 
     
     
       5. The wireless communication device of  claim 1 , wherein the trigger value is between zero and the size of the transmission window. 
     
     
       6. The wireless communication device of  claim 1 , wherein, to iterate the value of the CAC, the one or more processors are configured to:
 iterate, based on the transmission window, the value of the CAC by an amount equal to at least one of:
 a quantity of elapsed candidate resources available in the slot, 
 a quantity of elapsed available slots associated with the transmission window, or 
 a combination of the quantity of elapsed candidate resources and the quantity of elapsed available slots. 
 
 
     
     
       7. The wireless communication device of  claim 1 , wherein, to iterate the value of the CAC, the one or more processors are configured to:
 iterate, based on the transmission window, the value of the CAC by a fractional value of a quantity of time-frequency resources available in the slot. 
 
     
     
       8. The wireless communication device of  claim 1 , wherein, to iterate the value of the CAC, the one or more processors are configured to:
 iterate, based on the transmission window, the value of the CAC by a multiple of a fractional value of a quantity of time-frequency resources available in the slot. 
 
     
     
       9. The wireless communication device of  claim 1 , wherein the size of the transmission window is further based at least in part on at least one of:
 a channel busy ratio (CBR) for the slot to be used for the transmission of the packet, 
 a priority of the packet, 
 a quality of service (QoS) value of the packet, or 
 a combination of the CBR for the slot, the priority of the packet, and the QoS value of the packet. 
 
     
     
       10. The wireless communication device of  claim 1 , wherein, to iterate the value of the CAC, the one or more processors are configured to:
 iterate, based on the transmission window, the value of the CAC by an amount that is based at least in part on at least one of:
 a channel busy ratio (CBR) for the slot, 
 a priority of the packet, or 
 a combination of the CBR for the slot and the priority of the packet. 
 
 
     
     
       11. The wireless communication device of  claim 1 , wherein the wireless communication device is a network node. 
     
     
       12. The wireless communication device of  claim 1 , wherein the wireless communication device is a user equipment. 
     
     
       13. A method of wireless communication performed at a wireless communication device, comprising:
 iterating a value of a channel access counter (CAC) based at least in part on a transmission window, wherein a size of the transmission window is based at least in part on at least one of:
 a quantity of candidate resources that is available in a slot, 
 a quantity of slots associated with a transmission of a packet, or 
 a combination of the quantity of candidate resources that is available in the slot and the quantity of slots associated with the transmission of the packet; and 
 
 utilizing a channel access mechanism based at least in part on the value of the CAC satisfying a trigger value. 
 
     
     
       14. The method of  claim 13 , wherein utilizing the channel access mechanism comprises:
 utilizing, based at least in part on the value of the CAC satisfying the trigger value, the channel access mechanism to select a set of time-frequency resources for the transmission. 
 
     
     
       15. The method of  claim 13 , wherein the size of the transmission window is further based at least in part on at least one of:
 a priority associated with the packet, 
 a quality of service (QoS) value associated with the packet, or 
 a combination of the priority and the QoS value. 
 
     
     
       16. The method of  claim 13 , wherein the value of the CAC has a starting value that is based at least in part on the size of the transmission window. 
     
     
       17. The method of  claim 13 , wherein the trigger value is between zero and the size of the transmission window. 
     
     
       18. The method of  claim 13 , wherein iterating the value of the CAC comprises:
 iterating, based on the transmission window, the value of the CAC by a fractional value of a quantity of time-frequency resources available in the slot. 
 
     
     
       19. The method of  claim 13 , wherein iterating the value of the CAC comprises:
 iterating, based on the transmission window, the value of the CAC by a multiple of a fractional value of a quantity of time-frequency resources available in the slot. 
 
     
     
       20. The method of  claim 13 , wherein the size of the transmission window is further based at least in part on at least one of:
 a channel busy ratio (CBR) for the slot to be used for the transmission of the packet, 
 a priority of the packet, 
 a quality of service (QoS) value of the packet, or 
 a combination of the CBR for the slot, the priority of the packet, and the QoS value of the packet. 
 
     
     
       21. The method of  claim 13 , wherein iterating the value of the CAC comprises:
 iterating, based on the transmission window, the value of the CAC by an amount that is based at least in part on at least one of:
 a channel busy ratio (CBR) for the slot, 
 a priority of the packet, or 
 a combination of the CBR for the slot and the priority of the packet. 
 
 
     
     
       22. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
 one or more instructions that, when executed by one or more processors of a wireless communication device, cause the wireless communication device to:
 iterate a value of a channel access counter (CAC) based at least in part on a transmission window, wherein a size of the transmission window is based at least in part on at least one of:
 a quantity of candidate resources that is available in a slot, 
 a quantity of slots associated with a transmission of a packet, or 
 a combination of the quantity of candidate resources that is available in the slot and the quantity of slots associated with the transmission of the packet; and 
 
 utilize a channel access mechanism based at least in part on the value of the CAC satisfying a trigger value. 
 
 
     
     
       23. The non-transitory computer-readable medium of  claim 22 , wherein the size of the transmission window is further based at least in part on at least one of:
 a priority associated with the packet, 
 a quality of service (QoS) value associated with the packet, or 
 a combination of the priority and the QoS value. 
 
     
     
       24. The non-transitory computer-readable medium of  claim 22 , wherein the value of the CAC has a starting value that is based at least in part on the size of the transmission window. 
     
     
       25. The non-transitory computer-readable medium of  claim 22 , wherein the trigger value is between zero and the size of the transmission window. 
     
     
       26. The non-transitory computer-readable medium of  claim 22 , wherein the size of the transmission window is further based at least in part on at least one of:
 a channel busy ratio (CBR) for the slot to be used for the transmission of the packet, 
 a priority of the packet, 
 a quality of service (QoS) value of the packet, or 
 a combination of the CBR for the slot, the priority of the packet, and the QoS value of the packet. 
 
     
     
       27. An apparatus for wireless communication, comprising:
 means for iterating a value of a channel access counter (CAC) based at least in part on a transmission window, wherein a size of the transmission window is based at least in part on at least one of:
 a quantity of candidate resources that is available in a slot, 
 a quantity of slots associated with a transmission of a packet, or 
 a combination of the quantity of candidate resources that is available in the slot and the quantity of slots associated with the transmission of the packet; and 
 
 means for utilizing a channel access mechanism based at least in part on the value of the CAC satisfying a trigger value. 
 
     
     
       28. The apparatus of  claim 27 , wherein the size of the transmission window is further based at least in part on at least one of:
 a priority associated with the packet, 
 a quality of service (QoS) value associated with the packet, or 
 a combination of the priority and the QoS value. 
 
     
     
       29. The apparatus of  claim 27 , wherein the value of the CAC has a starting value that is based at least in part on the size of the transmission window. 
     
     
       30. An apparatus for wireless communication at a wireless communication device, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to cause the wireless communication device to:
 identify a value of a channel access counter (CAC) based at least in part on a transmission window, wherein a size of the transmission window is based at least in part on at least one of:
 a quantity of candidate resources that is available in a slot, 
 a quantity of slots associated with a transmission of a packet, or 
 a combination of the quantity of candidate resources that is available in the slot and the quantity of slots associated with the transmission of the packet; and 
 
 utilize a channel access mechanism based at least in part on that the value of the CAC satisfies a trigger value. 
 
 
     
     
       31. An apparatus for wireless communication at a wireless communication device, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to cause the wireless communication device to:
 identify a value of a channel access counter (CAC) based at least in part on a starting value of the CAC, wherein the starting value is based at least in part on a size of a transmission window; 
 utilize a channel access mechanism to select a set of time-frequency resources for a transmission of a packet based at least in part on that the value of the CAC satisfies a trigger value; and 
 transmit the packet via the set of time-frequency resources. 
 
 
     
     
       32. An apparatus for wireless communication at a wireless communication device, comprising:
 one or more memories; and 
 one or more processors, coupled to the one or more memories, configured to cause the wireless communication device to:
 identify a value of a channel access counter (CAC) based at least in part on a fractional value of a quantity of time-frequency resources available in a slot; and 
 utilize a channel access mechanism based at least in part on that the value of the CAC satisfies a trigger value.